Minelab GPX-4000 Service Manual download pdf (Page 22)

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Ground

Balance

Tracking

Fixed

Tracking

Fixed

Ground Balance

Reducing Ground Noise

The ground contains not only sand, but also many

different chemicals, minerals and salts. These extra

materials are referred to as ground mineralisation.

This ground mineralisation may often produce

erratic sounds, known as ‘ground noise’.

The Ground Balance function minimises the ground

noise while retaining maximum sensitivity to metal

targets. Ground Balancing the detector ensures that

signals from targets, such as gold nuggets, are not

confused with interfering ground noises.

The GPX-4000 has the ability to cancel out the

effects of ground mineralisation automatically, and

the Tracking function will maintain a perfect Ground

Balance while you search.

Tracking

Tracking instructs the detector to test for changes in

ground mineralisation and will automatically adjust

the Ground Balance setting, when necessary, during

detecting.

Tracking is preferred in heavily mineralised ground,

especially where the mineralisation is changeable,

or when you want to cover a large area quickly and

efficiently.

Fixed

Fixed holds the last Ground Balance setting. In

ground where conditions allow, Fixed will provide

greater depth, sensitivity and sharper target

signals, provided that a perfect Ground Balance is

maintained.

Fixed will give slightly improved performance but

will require re-balancing when necessary. Using the

Quick-Trak button is an easy way to do this.

(pg. 43)

Where possible, always search in Fixed position to

maximise depth and sensitivity, and only use Tracking

in areas with excessive ground noise and/or rapidly

changing mineralisation.

Quick-Trak Button

The Quick-Trak button found on the handle

assembly allows you to temporarily switch between

Fixed and Tracking, or vice versa.

The Quick-Trak button only changes the Ground

Balance position (Fixed or Tracking) while the button

is pressed. Once the button is released, the Ground

Balance setting returns to the switch position

selected on the front control panel.

The Quick-Trak button will most commonly be used

to Ground Balance the detector and also to fix or

hold the Ground Balance setting while pinpointing.

(pg. 43)

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Minelab GPX-4000 Service Manual Page 22

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